Answers this for me plzzz really quickly ?

Solve the system by the elimination method. 2x + y - 4 = 0 2x - y - 4 = 0 when you eliminate y, what is the resulting equation? a.x = 0 b.4x = -8 c.4x = 8

The table represents a linear function. what is the slope of the function? –6 –4 4 6

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.